handle file/dir cleanup errors gracefully

[tomkralidis]

Overview

This PR catches cleanup errors, logs the error and emits an ows:ExceptionReport response.

Related Issue / Discussion

#150

Additional Information

Contribution Agreement

(as per https://github.com/geopython/pywps/blob/master/CONTRIBUTING.rst#contributions-and-licensing)

• I'd like to contribute [feature X|bugfix Y|docs|something else] to PyWPS. I confirm that my contributions to PyWPS will be compatible with the PyWPS license guidelines at the time of contribution.
• I have already previously agreed to the PyWPS Contributions and Licensing Guidelines

[coveralls]

Coverage decreased (-0.1%) to 76.559% when pulling b382c83 on tomkralidis:issue-150 into be1d094 on geopython:master.

[ldesousa]

Do we want to the process to fail in case PyWPS fails to remove the temp folder? Wouldn't it be better to send back the response and simply log the exception?

[tomkralidis]

Good point @ldesousa. PR updated to only log the error.

[coveralls]

Coverage decreased (-0.1%) to 76.571% when pulling 2ab3909 on tomkralidis:issue-150 into be1d094 on geopython:master.

[coveralls]

Coverage decreased (-0.1%) to 76.571% when pulling 2ab3909 on tomkralidis:issue-150 into be1d094 on geopython:master.